I synced the 7DFPS code/unity project from Git and when I start Receiver from within Unity, the gun doesn't have the nice smooth feeling springy animation that the version I purchased from Steam does. Does anyone know how to turn this on?

I was messing with the Receiver springs before my GDC talk so I could show the before/after of all the different effects, so some of those may still be disabled in the Github build. You could try checking out the repository from before I made those changes, or could try making sure that any variables like "disable_springs" or "disable_recoil" are set to "false".